Impact

My approach is like this. Depending on what type of combat you are going to do. For instance on the MOON i use the slower ROF and prefer high impact because it is not typically close combat. You have the chance to shoot from a distance and number of enemies is lower and slower. However when playing STRIKE version of the games, AUTORIFLE with higher ROF is my choice, pair this gun with right hand armor for quick reload, correct chest plate to carry more ammo and good boots, all put together it will be a good choice. Hope this helps.